4. Design a Notification System
Deliver email, push and SMS with preferences, retries and honest delivery status.
ClassicMedium
Pick a system. Work through the problem. Compare your approach.
Company tags are community-reported. Counts on cards show how many people reported that design.
Deliver email, push and SMS with preferences, retries and honest delivery status.
Signed HTTPS callbacks for a billion events a day, at least once, retried for three days, with no endpoint able to slow another.